Electrical metallic tube, coupling, and connector apparatus and method

Abstract

A labor saving system, method, and apparatus for connecting or coupling lengths of electric metallic tubing (“EMT”). The invention uses couplings / connectors that have barbs that are designed to engage corresponding indentations on EMT to ensure proper installation. In one aspect, the invention is an EMT having: an EMT inner surface forming an EMT cavity; an EMT outer surface; an EMT first end; and at least one indentation in the EMT outer surface at or near the EMT first end, the indentation adapted to receive a corresponding barb from a sleeve device. In another aspect, the invention is a sleeve device comprising; a sleeve inner surface forming a sleeve cavity adapted to receive an end of an EMT; a sleeve outer surface; a first sleeve end; at least one barb on the sleeve inner surface at or near the first sleeve end, the barb adapted to engage a corresponding indentation on the EMT.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a divisional application of U.S. patent application Ser. No. 10 / 425,358, filed Apr. 28, 2003, which claims the benefit of U.S. Provisional Patent Application No. 60 / 360,723, filed May 15, 2002, both of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD OF THE INVENTION [0002] This invention relates to the field of tubing. More particularly, the invention relates to the field of electrical metallic tubing (“EMT”) apparatus including tubing, connectors and couplings, methods of coupling sections of EMT, and methods of connecting EMT to other apparatus such as junction boxes or transition fittings. BACKGROUND ART [0003] Currently EMT is connected by using one of two methods, either a set screw coupling or a compression coupling. The connectors are made from either electroplated steel or from die cast zinc. Set screw EMT couplings are sleeves which slip over the outside diameter of two opposing...

AI Technical Summary

Benefits of technology

[0009] It is an object of the present invention is to provide EMT, connector, coupling, method for connecting, and method for coupling which are quick and efficient to install.

[0010] It is a further object of the present invention is to provide an EMT, a connector for an EMT, and a coupling for an EMT that provides a safe and reliable ground path which does not depend on set screws being tightened and remaining tightened.

[0011] A still further object of the present invention is to provide an EMT, a connector for an EMT, and a coupling for an EMT that is efficient to manufacture.

Problems solved by technology

Existing EMT couplings and connectors require the installer to either turn a set screw or turn an “outer body.” The need to “tighten” a set screw or “turn” an outer body not only requires additional work space but is also subject to human error, such as inadequate tightening.

If threaded connections are subject to vibration, the screws and / or outer bodies can loosen over time, compromising the ground path.

Moreover, “twist tightening” increases the time and effort it takes for mechanics to install EMT.

Currently available snap fit connectors and couplings are expensive to manufacture and provide a less than optimal ground path.

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